Hi Pete. There's a new technology for glass blowing, instead of recuperation I opted for heat exchangers in cascade fashion to use all the heat. 6 pieces of gear from 1. 11/2" burner & 20 amps.http://www.pozible.com/index.php/archive/index/5706
Website coming soon, these are a DIY build, with online support.

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I would note here that this post is the only one in the thread which is recommended by the guy who made the equipment. The other posts are all recommendations from actual users of the equipment recommended. To me, that's worth noticing.